Abstract:

"In this review, material on the separation and assay of isotopes is presented. All of the available evidence on isotope effects in the biosphere is collected and discussed. The reader will find that while on the one hand a large fund of data is available on the laboratory separation and assay of isotopes, there is a paucity of reliable data on geochemical isotope effects. This situation arises from the fact that only recently have assay methods methods reached the precision required for application to geochemistry. The special role of biological systems in affecting isotope separations still remains to be established. Preliminary data already reveal such effects for hydrogen, oxygen, and carbon, and perhaps potassium. It can hardly be doubted that careful systematic studies with the newer techniques available will contribute much more valuable data, as well as resolve anomalies and uncertainties now existing in the present data"--P. 132.

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Bulletin of the American Museum of Natural HistoryThe Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.